浅谈电梯补偿装置的设计与安装

在当前的工程实践中,使用最普遍的为曳引式电梯。如图1所示,任何一部曳引式电梯都会包含以下几个基本的组成部分：曳引轮、轿厢、曳引钢丝绳、对重、随行电缆。电梯在运行过程中,轿厢侧和对重侧钢丝绳的长度不断变换,从而引起曳引轮两侧（轿厢侧和对重侧）钢丝绳重量的变化。当轿厢位于最低层时,钢丝绳的重量大部分作用于轿厢侧;当轿厢位于最高层站,钢丝绳的重量大部分作用于对重侧。     

一种常见电梯鼓式制动器的性能改进及其检验

制动器是电梯重要的安全部件,一旦失效,可能造成轿厢蹴底、冲顶、开门运行以致人员受到剪切伤害等严重后果。所以,电梯的制动系统除了电气制动外,还应有一个机一电式摩擦型的制动器,其兼备了驻车制动和行车紧急制动的功能。     

黄河卵石地层深水承台连续排桩加壁板组合式围堰施工技术

以兰州市元通黄河大桥两个主桥桥墩为例,介绍了在分选良好的大粒径卵石层中施工桥梁深水承台时采用连续排桩加壁板组合式围堰施工技术,实现了承台无水干作业施工,给出了施工中防止因施工控制导致渗漏的注意事项及封堵方法。实践证明,该方法工艺简单,安全性及止水效果好,经济效益明显。     

消防系统的技术革新

现在,市场上有许多火灾探测系统和探测装置,从比较简单的到尖端复杂的,种类繁多。现代火灾自动探测系统有两种类型:传统型和模拟量型,通常分别用于小型和大型两种不同的设施之中。传统系统采用两线辐射状电路监测各个区域,其基础是于70年代的简单的开/关技术。虽然新式的部件和     

Research on quality improvement of the cross section cut by abrasive water jet based on secondary cutting

A manufacturing system comprises production processes and building services, both of which are supplied by different energy carriers as well as raw materials and water. These resources interact according to complex relationships and are converted into products for sale and waste flows. Holistic resource accounting allows the analyst to consider the dynamic relationships between these components, including the strong interdependence between energy and water, which has been called the energy-water nexus. Exergy analysis is a method that accounts for mass and both the quantity and quality of energy, while allowing analysis on a common basis, and for this reason, it is used increasingly to analyse resource consumption in manufacturing systems; however, it has rarely been used to consider water flows alongside energy and material flows. The main contribution of this paper is the presentation of modelling water flows in terms of exergy in the context of sustainable manufacturing. Using this technique in combination with previously developed exergy-based methods, the result is a truly holistic resource accounting method for factories based on exergy analysis that incorporates water flows. The method is illustrated using a case study of a food factory in which a 4.1% reduction in resource use is shown to be possible by employing anaerobic digester in an effluent water treatment process. The benefits of this technology option would have been underestimated compared to the benefits of waste heat capture if an analysis based on mass and energy balances alone had been used. The scientific value of this paper is the demonstration of the relatively high exergy content of effluent flows, which should therefore be regarded as potentially valuable resources. The analytical method presented is therefore of value to a wide range of industries beyond the food industry.     

竹纤维发泡缓冲材料的研究

研究以竹纤维为原料,使其在水混合态中搅拌引起帚化,发泡剂在一定温度条件下分解产生气体,加入胶粘剂使纤维定向、结合,后在其他助剂作用下,形成很多小孔从而达到减小密度的目的,然后通过合适的干燥工艺,使材料具有开孔结构从而有一定的机械强度与缓冲性能的方法.最终对制品的外观和内部形貌进行表征,并对其性能进行研究并绘制出相应的F-x曲线、σ-ε曲线和c-ε曲线供缓冲设计用.     

驱水型挡风玻璃清洗剂的研制

采用乙醇、水、抗菌剂、驱水剂等添加剂进行复配,研制出具有较好驱水效果的挡风玻璃清洗剂。该清洗剂p H值接近中性,具有较好的驱水性能、清洗能力、橡胶相容性、树脂相容性和抑制金属腐蚀性能,适用于汽车挡风玻璃、反光镜、车窗玻璃的清洗,驱水效果明显。     

Synthesis and optimization of high-performance amine-based polymer for CO2 separation

Membrane technology features inspiring excellence from numerous separation technologies for CO₂ capture from post-combustion gas. Polyvinylamine (PVAm)-based facilitated transport membranes show significantly high separation performance, which has been proven promising for industrial scale-up. However, commercialized PVAm with low molecular weight and excessive crystallinity is not available to prepare high-performance membranes. Herein, the synthesis process of PVAm was optimized by regulating polymerization and acidic hydrolytic conditions. The membranes based on PVAm with a molecular weight of 154 kDa and crystallinity of 11.37% display high CO₂ permeance of 726 GPU and CO₂/N₂ selectivity of 55 at a feed gas pressure of 0.50 MPa. Furthermore, we established a PVAm synthesis reactor with an annual PVAm solution (1%(mass)) capacity of over 7000 kg and realized the scaled-up manufacture of both PVAm and composite membranes.     

超临界CO2萃取功能性油脂的研究进展

对超临界CO2萃取技术的原理、特点和国内外研究现状进行了介绍,综述了该技术在功能性油脂提取领域的研究进展。讨论了萃取压力、萃取温度、萃取时间、CO2流量、夹带剂等因素对油脂萃取率的影响;对比了不同类型油脂对超临界CO2萃取参数的需求,并分析了超临界CO2萃取的油脂产品指标及品质优势,对其应用前景做出展望。      

植物乳杆菌对猕猴桃酒降酸效果的研究

本研究旨在通过植物乳杆菌和酒类酒球菌引发猕猴桃酒的苹果酸-乳酸发酵,筛选出猕猴桃果酒的后发酵的适宜菌株。实验选用植物乳杆菌CS-1、XJA-2、XJ-14、XJ-25、520、542、544以及酒类酒球菌31MBR八株菌对自酿猕猴桃酒进行降酸。通过单因素实验以及中心实验设计（CCD）筛选最佳的猕猴桃酒后发酵菌株并优化其降酸条件。结果表明植物乳杆菌520在酒中生长快速,降酸效果最佳。所得最佳条件为:接种量6.7%,p H3.5,温度21.6℃。在该条件下验证得到苹果酸的降酸率为63.89%,因此可以有效降低猕猴桃果酒酸度,故植物乳杆菌520可作为新一代猕猴桃酒降酸的潜在菌株。